Apparatus for testing brakes



July 25, 1933 G. wBRoGAN 1,919.929

APPARATUS FOR TESTING BRAKES Filed Jan. 9, 1928 l 4 sheets-sheet 1 A TTORNEYS.

July 25, 1933. G. W. BROGAN APPARATUS FOR TESTING BRAKES Filed Jan. 9, 1928 4 Sheets-Sheet 2 I N VEN TOR. @Alb/03M BY l afnam W' A TTRNEYS.

wat? rf July 25, 1933. G. w. BROGAN APPARATUS FOR TESTING BRAKES Filed-Jan. 9, 1928 4 Sheets-Sheet 5 fyj INVENTOR.

Bya/ any Hrm July 25, 1933. G, w BROGAN APPARATUS FOR TESTING BRAKES Filed Jan. 9', 1928 4 Sheets-Sheet 4 INVENTOR.

A gno nene-a *ne 12's", 15533 i and aringeinent of systems apipglliafiiis and h and'illiistifated in? the faconipanying finge l wherein is' f shown 1 the?, pre lire" bo'dime'nt 'ef my inveniom# but appended. i

In thedrawing's hf the'f llelfeindedi'ibed embodiment Zoff my4 iliy'en'inon?` Figure' 1S faplan` View; of af device for Qai'iyingeub my enlarged View in elevation-,fpaLi-'lyfinSecienl neme@(livin-fresh@mms@ (intentY Such 21s,v anhand of vnietzilfwire 130136,` chain,

throgli'oiit the Several l Views.

i 'i this surface f should Y have but smallslipbge infcontactWith-said tire;` AThis surface, vfor durability and service, maybe simply on said metalmay be provided. n A Y 6 ere-'equaliging'"barsconnectingjcontct 'lEplfitesY 3, "Owing the Seme Duiuely-e y operatiein tliejdetminationofthe relative non-slippage Contact y with" the tire Vvtivelv; these -Vja're shown in E ig'sw.(i` and `9.@ Thesebars are connected by` fnyl convenientmethod Withrontectlplete 3, esjsliovvn; Figs. 6 andQ, designed to as "a ene-tooth f' `pinion ine one-,tooth 'iaclegwhen injrcoiitact j jivith' Vthesidesi'o saidplatesf ai birs l J1 Serev theeompression chambers,- asshovvn -iniligzA l2 -o special design, 'preferably ,of g vrubber and veryglexible. i I have, however,

rubberfhose, oneend beingypluggedgiandthe f plate 2 so that fby e i relative;` movement of -"said ftwoy plates; coin-pressingeonipression- ',-30f chamber 8 Willeftuse'tlie fluid therein to be Y forced out. y While, liz-have described flexible, organici--eimpression chamber, A`I fdo not Gn-fpiston w i piston rodll?, Whiclioperetes diei`- 115; .lThie dial-fis provided with handle: 16, thus acting v as a means orfoperating pistonrodrlllto 1 center the dial endl pistongforsmljilstme1it,iy i when necessary opening thejthree-wfiy valve'Y 1I is dizil operating-ineens, yor

' -v 32 betweenthesends-efsaidcylinder10 l with v vcompression 'chambers 8, Vone Send to` l one compression. chamberendtheiother fendV Y Y to "the other compression chamber 'of "the rel iff speetive` devices mutuallycofoperating 3 be'- VlOnfthe endofbaseplete 2 is'e butting y means 17,'asf-'shown in Fig. 3, `fabricated I t ibybending'iip'theend of-ba'se plate 2. On` i l roughened metal,l but in` order'f to 4provide;

he end offcontaot'plate is also abutting rtnduheld positionr si Eoontinuebaise plateff2 sindv .buttingfmens V17, Y

contactplete Sbetween it and compression" vformoffrlevice shownV in Fige 1, cross-braces x= theseare "desirable E11-rider *,lc'ertain -,conditi ons7 l 7and under other conditions may bey omitted; .Theye're used'85 ltofjreletiyely 'space' ef pairV ofthese brekei ftestingidevices so 'as to `permit af vehicle to f f-Pl'epierl' V*other connecteditofthe indieziting ineanf s. lThe; fonction' of this?.A compression chamber.y `is to" *cushion lbetweenthe' end A off'contgijotf platee 3; and the projection l seclliredn )to base- `be`attachedby, flohorfastenings `5.` i i ibarseonnected byylinls 22' etV their' respec-v tive endsQto' oo ntaot plates 3, lind areffiilcrunied inf anzidjlistinguneans,as shown i'n 295v d sliding block 23, 6in i; order that :in reti oV adl j jnstment, maybefmede with reference to WishjV 'to limit"myself` to such, es, ametal diaphragmi operating inidwill accomplish ithesmnepurpose. In Figs. 2,` 5 randll, I haveshovvnfone form of an: indicating means; v which "I Will Lfdesignate :as 9, and in Fig. 8, l show another 4g .form o fgindieiting means, 95, A -1 l A2' sensitr eness control j `is provided, and

ists-o ziibrakeiin the ,forms, illustrated 6, Tend 1431er el `valve 29, es Y shown in ligsy2,5,8a1id1114 v.This Controlisused f tourender;theoperationof tliedevice more T1110V v1ceshoiy n` in Fig'. 14, this" control.y ie" vapplied bend i Which-,nmygbeeither,I metal or "fubrie, En rope,,Whichmeybe either metal or Afibre,

or mchjailn, operatingiover directing memslzS -vrpiilleys-B; these flexible Connecting"means Y mieqsecured "tof the respective cont-act, pl fates Y eens l18. ,Between these tvvo butti'ngmeane :10 `*operatesfconipressioh ehamber8; *19 is a Y" rider, plateriding overtheend of contactv cliztmberfSby-*nieans ofbuttingfmeans 18V 80 tachedjto, the Hoor, or, if desired, lit may o9()4 i the respective movement. of vthe-.two contact ably glycerine, or water. lIntheftype shown.

in Fig. 2,..this Yis `done' by illinggthroughfill ing pipe 30 until` the system' is filled. "FI-hree fair 'i Vvalves 29 VKare closed@A In the formsshowninFigs; 6, 8 and .9,1 [the contact plates 3 are mutually operated by equalizing bars. 6,v and the diierence in 'way cock 32is then turned vsothat the oppo- Sitefend'sof cylinder 1() are iii-communication, when vby means of'operating handle 16 dial. 15 is adjusted to a'neutral. point, valves 29 being open,.or,partly` open', andi-upon reaching theproper adjnstmentff'threway cock 32 is closed" against.geverydirection,

especially closing the respectiveends of l the cylinder 10. c f i 1A vehicle, the lbrakes of-'which are to. be

tested, is driven onto `contact'plates Si and the brakes areapplied. vIfboth brakes act equally, there will bel no kmovement `ofgdi-al 15.v` If onebrake holdsmore `than thefother,

'the Contact plate' under the same will: cause an increased hydraulic pressure in compres.-

vehicle wheels and 4their sustained loadsfmay lbe moved over in the operatiolrfto the4 vesion chamber 8 againstwhich thatjplate op# `Yerates,r thus causing piston 111' to operate vagainst the lesser pressure Ain the other Ycompression chamberv `thereby. operating y .piston frodf 14:v and dial 15. f .z

Gauge 3.1 is a differential gauge; onedialY being connectedto :one of the respective compression chambers .and the. other .dial being connected to the other of the respectivevcompression chambers, Vthe gauge-.will give an immediatereading of thepressure in these two. compresslon chambers. respectively when movement of thetw'o plates respectivelyis indicated: by the compressionof the butting means 17 of said platesagainst compression chambers Sand indicatedat the gauge tubes In Vthe connectingl means, vor piping, Yconnecting gauge tubes 31 to compression .cham-fV bers 8, is relief check valve 39, provided with Where both a hand relief means 40for lifting-the valve so that the fluid mayreturn: from. gauge tubes 31. y

the vehicle are to -be tested', -adouble device, such as shownn Fig. 4 or9, is used.

Referring to Fig; 8, thesecuring ofthe two respective base plates isshown by bolting the same to rider plate Y19 .where it isv desired to secure the same togetherasxan integral whole, or they may be .individually placed on the floor. and secured where the modification shown in Fig-fis used; A

` In the j sensitiveness control especially applied to the modicatiomshown in Figs.

4f and/5, through the medium ofgvalves 29,

thesevalves maybe adjustedfor a ratio debrakes on rthe'same. side of orless throttling; alike effect or adjustmentv Y maybehad through thek mechanical braking v or retarding means for sensitiveness..

In the specilication and drawings, 'I have V'shown vcontact-plates 3, in sliding. contact -with basepl'ate `2, forfsim licity` of construction. anti-.friction e'vioe maybe `used between these two-operating bodies, such` as ballfbearings, rollers, or; the likeg, vbut as,v I

' claim nothing in4 this application concerning therespective mountings between base. plate vv.Zand contact plate 3,1I'l1ave not` shownya modification thereofembod-ying the :various I possible ways'of mounting..y

" '-.Havingthus described my. inventiomwhatf yIfclai-mand .desire toA4 secure by Letters Paltent is:

.prising two plane members-upon 4'which two 1. A* vehicle brake testing -apparatus comi-'IV hicle, independentmeans. Jiorresisting 'the movement of .said members each consisting ot variable fluid-confining means, saidmeans being connected by1 communicating ,conduits wherebyivariable movementiof said members y' causexrelative; iow throughrsaid conduitso Y that the. pressure in each fluid cushioning vmeansis the same with relation to each member respectively', meansV for determining 'the flow` in said conduit caused by any diier- .i ence 1n pressure on said. fluidiconmngmeans toindicate the relative displacement of-said members at the quiescent period after said `movement has' occurredand said fluid .has ceased to iow.

2. A. vehicle brake testing appratuslcom.-

bemoved over in the operation of the vehicle, independent means for resisting the 'prising two plane members upon'whichftwo 1 vehicle wheels'4 and their sustained loads may f movement 'fof said members each consisting of variable uid confining means, said means being connected by communicating conduits f whereby variable.movementV ofsaid memberscause relative fow through said conduit 'so that the pressure in each fluidcush-" l ioning meansfis the same with relation to each member respectively, means/for deter-V mimngfth'e flow in said conduit caused [byloiV any dilerence in pressure on .saidtluid 0011-' fining means to indicate "the relative dis? Aplacement .o said membersat the quiescent period after said movementhas occurred andy said luidhasj ceased to flow, and` means :tori

restoring said .members to `initial position. f A vehicle brake testing-.device consisting of a plurality of surfaceplates over which thel wheelsfof va vehicle the brakes of 'which are to be tested are driven, meansniutually con trolling said'plates whereby thejrelat-ve movement ofL said plates must be inopposite y directions, a fluid cushioning meansagainst Whicheach 'of said4 platescushion respecnV tively, meansl for eonveying-jiuid tot eachfof saidv eushioningimeans i from"` a mutually controlled source, and adjustable means for retarding the ation.4

4. A vehicle brake*testing-"device con#V sisting of members each:` provided Withfplane upon Y, by movement roi said "su`r:t'aces, saidk mea-ns fbeing connectedV by communicating conduits whereby variable movement of .said confining meanseauses relativeilovv through `said lconduits so'that the pressureV 1n each fluid cushioning means is the same" with relation to each member respectively. f5. A vehicle `brake testing device consist-y Ving of members each provided WithV plane surfaces upon WhichV surfaces the` Wheels movements of said` plane surfaces relatively l whereby the relative `movement ot'said` sur Ofa vehicle and their'sustained loadsare contacted, means, mutually controlling the opposite.V directions, a 1 fluidmeans againstvvhichweach of said plates `faces. mustbe in .opposite directions, Consistingof variable fluid confining means, said means being connected by` icommunicating conduits whereby variable movement of said confining means Acauses relative flovv ,through i saidjeonduits soy vthatwtlie .pressure in each liluid cushioning means is the samefwith rel `la'tioniptof each member respectively, means fort determining the loW in said, conduitV causedby any difference in pressure on said `fluid confining means tol-"indicate the rela-l tive displacement of' said vmembers at a quiescent ,periodl after said-movement has occurred and saidiiuid has ceased tooW.

fz, 6; "A `vehicle brake testing device consisting offa plurality of surface plates over which the Wheels of a vehicle the brakes oi which are toV bel testedsareldriven,.means mutually controlling said. plateswhereby the relative movement of said' plates must be in cushioning cushion viespectively, means for conveying fluidto each ofsaid cushioning` means from afmutually ,controlled` source, and'y adjustable means iorqretarding the lowfof said flu-id in; its operation to each of saidsurfaee plates respectively whereby aratio adjust-w i ment may bev obtained for the simultaneous lopera'tionofl said-platesfr. A, a GRAHAMV. BROGAN: .a 

